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. . portion of it need be returned to the stream after use. Return flows from non-reusable water, on the other hand, belong to the receiving stream after initial use and cannot be reused. Typically, reusable water is imported to the South Platte Basin from another basin or comes from water rights that were originally used for agriculture and have changed to municipal use. Reusable water that is treated at one of Denver's water treatment plants is tracked until it returns to a stream through a wastewater treatment plant or by groundwater return flow from lawn irrigation. The opportunity frequently exists for Denver Water to exchange reusable return flows for water diverted at a facility upstream. The primary sources of reusable water in the collection system come from the Roberts Tunnel Collection System, the Cabin-Meadow Creek Collection System, and former agricultural water rights. . . Exchanges and Transfers . In an exchange, reusable water is added to a stream at a downstream point to enable diversion of the same amount at an upstream location. In a transfer, water is released from an upstream reservoir so it can be stored in a downstream reservoir or delivered to a water treatment plant. Exchanges increase the amount of water that can be legally diverted at an upstream location. Exchanges that would injure a senior water right between the replacement and diversion point cannot be performed. An important source of replacement water for Denver's exchanges is the reusable water returning to the South Platte as effluent from specific Denver area wastewater treatment plants. . eo Exchanges and transfers give water operators the flexibility needed to move water from place to place within the collection system. For example, if operators want to store water in Dillon Reservoir when such storage is out-of-priority, they can perform a Williams Fork-to-Dillon water exchange. The exchange would be accomplished by releasing water out of Williams Fork for use by downstream senior water rights and storing a like amount of water in Dillon. An example of a transfer is the conveyance of water from Gross Reservoir to Ralston Reservoir to meet water needs at the Moffat Water Treatment Plant. . Some of the exchanges commonly performed within the collection system are listed below: · Williams Fork Reservoir to Dillon Reservoir · Metro Wastewater Treatment Plant to Strontia Springs Reservoir · Bi-City Wastewater Treatment Plant to Strontia Springs Reservoir . Williams Fork Reservoir to Moffat Tunnel · Chatfield Reservoir to Cheesman Reservoir . . Hydropower There are five hydroelectric power plants associated with the raw water collection system. Key features of these power plants are given in Table III-I below: . 17